496 



VermoreVs Injector for Carbon Bi-sulphide. Among the 

 numerous insecticides proposed and experimented upon for destroy- 

 ing the phylloxera and other ground pests, carbon bi-sulphide has 

 been found the most reliable as well as the most efficacious. It is a 

 colourless liquid, heavier than water (1*271 at 15 deg. C.), very 

 volatile (boils at 48 deg. C.=102 deg. F.), and catches fire very 

 rapidly. "Workmen using it should, for this reason, carefully refrain 

 from smoking, and avoid carrying matches. 



Considerable difficulty was experienced at the beginning in the 

 application of the insecticide round the roots, and in properly 



regulating its dose, until specially 

 designed forcing pumps came into 

 use, one of the best of which is here 

 shown. 



The forcing-pump considered, 

 so far, the best for the purpose of 

 injecting the insecticide liquid into 

 the soil is the one here described, 

 and is manufactured by VermoreL 

 Its price in France is about 55 

 francs 



It consists of a copper reser- 

 voir, R, holding about a quart of the 

 liquid, which is introduced through 

 the opening, F, closed by means of a 

 screw plug. The piston Y Y, sur- 

 mounted by the knob, N, works in 

 the pump, A, and is fitted at its 

 extremity with a cup-shaped leather 

 cap, B. A spring, M, drives the 

 piston upwards each time it has 

 been pressed down in injecting the 

 liquid. Underneath the piston, two 

 small openings, I), place the reser- 

 voir ^n communication with the 

 chamber, T. On pressing the piston 

 down, the bi-sulphide of carbon is 

 driven into the tube, E, and by push- 

 ing a plug, J, fills up the chamber, 

 G, whence it is forced out of the 

 steel needle, I, through the opening 

 K, into the soil. 



In order to regulate the dose of 

 bi-sulphide of carbon at each injec- 

 tion, one or more rings, Z, are strung 

 on the piston rod. The pump is so 

 graduated that each time the piston 

 is pressed down, 10 grammes (154 

 vermorai's injector. grains, or ^oz.) is injected into the 



